/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.document.ui.dialogs;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IInputValidator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * Base class for validated text input dialogs.
 * 
 * @author Marko Luukkainen <marko.luukkainen@vtt.fi>
 *
 */
public abstract class TextInputDialog extends Dialog{

	// cache for all used validators
	private Map<IInputValidator, String> validators = new HashMap<IInputValidator, String>();
	
	protected TextInputDialog(Shell parentShell) {
		super(parentShell);
	}
	
	protected boolean validate(Text text, IInputValidator validator) {
		String err = null;
		if (validator != null)
			err = validator.isValid(text.getText());
		// add validator to the cache
		validators.put(validator, err);
		Control button = getButton(IDialogConstants.OK_ID);
		
		// disable ok button if any of the validators are reporting errors. 
		if (button != null) {
			boolean valid = true;
			for (String s : validators.values())
				if (s != null)
					valid = false;
			button.setEnabled(valid);
		}
		if (err != null) {
			text.setForeground(Display.getCurrent().getSystemColor(SWT.COLOR_RED));
			text.setToolTipText(err);
			
			return false;
		} else {
			text.setForeground(Display.getCurrent().getSystemColor(SWT.COLOR_WIDGET_FOREGROUND));
			text.setToolTipText(null);
			return true;
		}
		
	}
	
	protected String updateName(String url, String name) {
		
		if (url.length() > 0 ) {
			if (name == null) {
				return new String(url);
			} else if (Math.abs(url.length() - name.length()) <=  1) {
				int common = Math.min(name.length(), url.length());
				if (name.regionMatches(0, url, 0, common)) {
					return new String(url);
				}
			}
		}
		return null;
		
	}

}